/*
 * Copyright (c) 2007 Team and Concepts Limited.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Team and Concepts Limited nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TEAM AND CONCEPTS LIMITED ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL TEAM AND CONCEPTS LIMITED BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;

namespace EditGrid.API.Client.Atom
{
    public class AtomFeed
    {
        private XmlDocument xmlDocument = null;
        private List<AtomEntry> entryList = new List<AtomEntry>();
        private EditGridService service = null;
        private long startIndex = 0;
        private long totalResults = 0;
        private long itemsPerPage = 0;
        private bool isEntry = false;

        internal EditGridService Service {
            get { return this.service; }
            set { this.service = value; }
        }

        public bool IsEntry
        {
            get { return this.isEntry; }
        }

        public long StartIndex
        {
            get { return this.startIndex; }
        }

        public long TotalResults
        {
            get { return this.totalResults; }
        }

        public long ItemsPerPage
        {
            get { return this.itemsPerPage; }
        }

        public List<AtomEntry> Entries
        {
            get { return this.entryList; }
        }

        internal static AtomFeed LoadXml(XmlDocument xmlDocument) {
            AtomFeed feed = new AtomFeed();

            feed.xmlDocument = xmlDocument;

            XmlElement element = xmlDocument.DocumentElement;

            if (AtomUtil.IsAtomElement(element, "entry"))
            {
                AtomEntry entry = AtomEntry.LoadXml(element);
                feed.entryList.Add(entry);
                feed.isEntry = true;
            }
            else if (AtomUtil.IsAtomElement(element, "feed"))
            {

                XmlNodeList nodeList = element.ChildNodes;
                foreach (XmlNode node in nodeList)
                {
                    if (node.NodeType == XmlNodeType.Element)
                    {
                        XmlElement e = (XmlElement)node;
                        if (AtomUtil.IsAtomElement(e, "entry"))
                        {
                            AtomEntry entry = AtomEntry.LoadXml(e);
                            feed.entryList.Add(entry);
                        }
                        else if (AtomUtil.IsOpenSearchElement(e, "totalResults"))
                        {
                            feed.totalResults = long.Parse(e.InnerText);
                        }
                        else if (AtomUtil.IsOpenSearchElement(e, "itemsPerPage"))
                        {
                            feed.itemsPerPage = long.Parse(e.InnerText);
                        }
                        else if (AtomUtil.IsOpenSearchElement(e, "startIndex"))
                        {
                            feed.startIndex = long.Parse(e.InnerText);
                        }
                    }
                }
            }
            else
            {
                throw new InvalidOperationException("Not a Atom feed");
            }
            
            return feed;
        }

    }
}
